The bottom rib is completed and the spar is closed up with plywood. The shape of the leading edge is not linear and therefore needed

Contrary to the bottom rib flanges which are made of poplar wood, the other rib flanges are made of laminated spruce.  It requires a jig

Work on the bottom rib has started. It is built from a plywood sheet and flanges of poplar wood. Why this must be poplar wood

The very first item to be built is the spar for the vertical stabiliser. Is made of two laminated spruce planks glued into a conical